As binaural audio continues to permeate immersive technologies, it is vital to develop a detailed understanding of the perceptual relevance of HRTFs. Previous research has explored the benefit of individual HRTFs with respect to localisation. However, localisation is only one metric with which it is possible to rate spatial audio. This paper evaluates the perceived timbral and spatial characteristics of both individual and non-individual HRTFs and compares the results to overall preference. To that end, the measurement and evaluation of a high-resolution multi-environment binaural Impulse Response database is presented for 20 subjects, including the KU100 and KEMAR binaural mannequins. Post-processing techniques, including low frequency compensation and diffuse field equalisation are discussed in relation to the 8802 unique HRTFs measured for each mannequin and 2818/2114 HRTFs measured for each human. Listening test results indicate that particular HRTF sets are preferred more generally by subjects over their own individual measurements.

Audio Description for film and television is a pre-recorded track that uses verbal descriptions to provide information on visual aspects of a film or TV programme. In the UK it is currently the only accessibility strategy available for visually impaired audiences and although it provides access to a large number of people, its shortcomings also fail to engage others in audiovisual experiences. The Enhancing Audio Description project explores how digital audio technologies can be applied to the creation of alternatives to Audio Description with the aim of personalising access strategies. Such personalisation would allow users to select the method utilised to access audiovisual experiences, by having choices that include traditional forms of accessibility as well as sound design based methods. The present article analyses the results of a survey and focus groups in which visually impaired participants discussed the advantages and disadvantages of AD and it demonstrates not only the diversity of experiences and needs of visually impaired groups but also their eagerness for change.

Individuals with autism spectrum disorder (ASD) are characterised as having impairments in social-emotional interaction and communication, alongside displaying repetitive behaviours and interests. Additionally, they can frequently experience difficulties in processing sensory information with particular prevalence in the auditory domain. Often triggered by everyday environmental sounds, auditory hypersensitivity can provoke self-regulatory fear responses such as crying and isolation from sounds. This paper presents SoundFields, an interactive virtual reality game designed to address this area by integrating exposure based therapy techniques into game mechanics and delivering target auditory stimuli to the player rendered via binaural based spatial audio. A pilot study was conducted with six participants diagnosed with ASD who displayed hypersensitivity to specific sounds to evaluate the use of SoundFields as a tool to reduce levels of anxiety associated with identified problematic sounds. During the course of the investigation participants played the game weekly over four weeks and all participants actively engaged with the virtual reality (VR) environment and enjoyed playing the game. Following this period, a comparison of pre- and post-study measurements showed a significant decrease in anxiety linked to target auditory stimuli. The study results therefore suggest that SoundFields could be an effective tool for helping individuals with autism manage auditory hypersensitivity.

Enhancing Audio Description is a research project that explores how sound design, first-person narration, and binaural audio could be utilised to provide accessible versions of films for visually impaired audiences, presenting an alternative to current audio description (AD) practices. This article explores such techniques in the context of the redesign of the short film ‘Pearl’, by discussing the creative process as well as evaluating the feedback supplied by visually impaired audiences. The research presented in this article demonstrates that the methods proposed were as successful as traditional AD in terms of providing information, enjoyment, and accessibility to audiences, demonstrating that both practices can coexist and, as a result, cater for the different stylistic preferences of end users.

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